在酸托管的金属有机框架中扩大Ni-O键的极化性,用于增强水氧化电催化
Wenfang Zhai1, Ya Chen1, Yaoda Liu1
1State Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University, Xi'an 710049, People's Republic of China.
ACS nano
|August 31, 2023
概括
研究人员开发了一种新的催化剂NiMOF/BP,通过激活晶格氧氧氧化机制 (LOM) 来增强氧进化反应 (OER). 这一突破为高效的氧化水催化剂提供了新的设计标准.
科学领域:
- 材料科学 材料科学 材料科学
- 电化学 电化学 电化学
- 催化剂是一种催化剂.
背景情况:
- 晶格氧氧化机制 (LOM) 提供了克服氧化演化反应 (OER) 催化中的缩放关系的潜力.
- 目前引发LOM的合理性受到辩论,需要明确的催化剂设计的物理化学范式.
研究的目的:
- 理论上描述和构建一个Ni金属有机框架/黑 (NiMOF/BP) 异构结构,用于LOM衍生的OER研究.
- 确定Ni-O键极化性作为LOM基电催化剂的关键设计标准.
主要方法:
- 对NiMOF/BP异构结构的理论概况.
- 试验构建和描述NiMOF/BP催化剂.
- 对OER性能和稳定性的电化学测试.
- 对反应机制和电子性质的计算分析.
主要成果:
- 该p型黑主体通过协同的Ni-O键拉伸和Ni价值下降来增强NiMOF的Ni-O键极化性.
- 这种扩大的极化性通过减少晶格氧气限制,促进了LOM路径.
- 优化的NiMOF/BP催化剂实现了低超电位 (260 mV在10 mA cm−2) 并在1M KOH中证明了长期稳定性.
- 实验和计算数据证实了一个激活的LOM路径与平衡的步骤障碍.
结论:
- Ni-O 键的极化性被认为是设计高效的 LOM 电催化剂的关键因素.
- NiMOF/BP异构结构是推动LOM驱动的水氧化的一个有希望的平台.
- 这项工作为开发下一代OER催化剂提供了一个精简的物理化学范式.
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